After enable discount, you can see discount option is available in your voucher entry after rate column.

For Example, I have sold 5 Nos goods @ 500 to a customer and give him discount of 5% and after that i have charge GST @ 18% on net amount of Rs. 2375 after discount. Then following entry would be passed in this transaction:

How to Charge GST after discount in Tally.ERP9?
Reviewed by Tally Knowledge
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